This is the BlueBiscuit GoogleWhack page. The idea is that if you enter the words "bluebiscuit" and "googlewhack" into Google, this is the only page that will be listed.
This is of course a contrived example, being the result of picking two relatively rare words - one of which is a domain name that few people recognise - and placing them together on the same page.
For this to work, those two words must not appear on any other web page. In particular, any page that links to this page must not use both of those words. For example, I have created a link to here from the BlueBiscuit home page, but the page does not mention "googlewhack". Obviously the BlueBiscuit home page mentions "bluebiscuit".